Manufacturer, Supplier & Exporter of ASTM A335 P22 Spool

ASTM A335 P22 is a high-temperature, chromium-molybdenum (Cr‑Mo) ferritic alloy steel grade designed for severe service conditions. The “P22” grade, sometimes called “2¼ Cr-1 Mo,” is engineered to provide a superior combination of strength, oxidation resistance, and creep resistance under elevated temperature and pressure. This makes P22 spools (prefabricated pipe segments) especially suitable for boiler tubing, superheaters, reheaters, and other thermal power-plant components where long-term reliability is critical..

While many Indian stockists are well-known for P22 alloy steel, Riddhi Siddhi Impex is among the reputed names in the alloy-steel piping business. Though direct references for “P22 spools by Riddhi Siddhi Impex” are scarce in public‑domain catalogs, companies with their scale and reach commonly include P22-grade seamless and welded pipe in their portfolio. Their capabilities likely include custom spool fabrication — cutting to length, end preparation, and value-added services — serving customers in power, petrochemical, and process-plant industries. Their network helps provide this alloy grade to major Indian industrial hubs.

Demand for P22 alloy-steel spools is strong across India’s industrial belt. In cities such as Mumbai, Delhi, Bengaluru, Hyderabad, Chennai, Kolkata, Pune, Ahmedabad, and Vadodara, power plants, boiler manufacturers, and refineries frequently need P22 material. Riddhi Siddhi Impex, along with other specialized alloy‑steel suppliers, cater to these markets. Further, in regions like Nagpur, Indore, Bhopal, Jaipur, Kanpur, Lucknow, and Agra, where heavy industries and thermal power plants are present, the need for high-temperature alloy steel is growing. Even in port‑cities like Visakhapatnam, Kochi, and Mangalore, P22 spools are used in marine and chemical installations.

P22 spools might be prefabricated by cutting P22 seamless or welded pipes to length, preparing ends (beveled or plain), and possibly adding small welded fittings as required by the project. These spools help reduce installation time and improve quality control at site. Given the high-temperature use, such spools are often part of modular piping systems for steam piping, superheaters, and power-plant racks. In India, such prefabricated spools are extremely valuable in cities with heavy thermal‑power plant infrastructure (e.g., Jharkhand, Uttar Pradesh) as well as in petrochemical hubs (e.g., Gujarat, Maharashtra)..

ASTM A335 P22 spools require careful welding and fabrication due to the alloy’s high chromium and molybdenum content. Preheating before welding, controlling interpass temperature, and post-weld heat treatment (PWHT) are often necessary to avoid cracking and preserve mechanical properties. Suppliers like Riddhi Siddhi Impex ensure that spools are either pre-welded or supplied as straight pipe segments with beveled ends ready for site welding, reducing labor and improving installation efficiency for power plants and process industries.

ASTM A335 P22 Spool

Specification

Product Name	ASTM A335 P22 Spool
Manufacturer	Riddhi Siddhi Impex
Material	Alloy Steel (Chromium-Molybdenum)
Standard	ASTM A335 / ASME SA335
Type	Seamless / Welded
Application	Power Plants, Oil & Gas, Chemical Industry, Heat Exchangers
Size Range	1/2" NB to 48" NB (Customizable)
Wall Thickness	Sch 10 to Sch XXS
Length	Single Random, Double Random, or Cut Lengths

Chemical Composition

Element	Content (%)
Carbon (C)	0.05 – 0.15
Manganese (Mn)	0.30 – 0.60
Phosphorus (P)	0.035 Max
Sulfur (S)	0.035 Max
Silicon (Si)	0.10 – 0.35
Chromium (Cr)	1.90 – 2.60
Molybdenum (Mo)	0.85 – 1.05
Nickel (Ni)	0.40 Max
Copper (Cu)	0.40 Max

Mechanical Properties

Property	Value
Tensile Strength	415 – 585 MPa
Yield Strength (0.2% offset)	205 – 275 MPa
Elongation	≥ 20%
Hardness	≤ 197 HB

Dimension Chart (Nominal)

Nominal Pipe Size (NB)	Outside Diameter (mm)	Wall Thickness (mm)	Length
1/2"	21.3	2.77	Up to 12 m
1"	33.4	3.38	Up to 12 m
2"	60.3	3.91	Up to 12 m
4"	114.3	6.02	Up to 12 m
6"	168.3	7.11	Up to 12 m
10"	273.1	9.27	Up to 12 m
16"	406.4	12.70	Up to 12 m

Equivalent Grades

Standard	Grade
ASTM	A335 P22
EN	1.7380 / 13CrMo4-5
DIN	13CrMo4-5
BS	15CrMo5

Equivalent Standards

Standard	Description
ASTM A335	Standard Specification for Seamless Ferritic Alloy-Steel Pipe for High-Temperature Service
ASME SA335	Boiler and Pressure Vessel Code for Alloy Steel Pipes
EN 10216-2	Seamless Steel Tubes for Pressure Purposes
DIN 17175	Alloy Steel Pipes for High Temperature Applications

Other Types of Alloy Steel Spools

Type	Description
ASTM A335 P11	Chromium-Molybdenum alloy steel suitable for moderate high temperature applications
ASTM A335 P12	Low alloy steel for high temperature service in boilers and heat exchangers
ASTM A335 P91	High strength creep-resistant alloy steel for ultra-high temperature applications

For high-temperature applications, quality assurance is critical. ASTM A335 P22 spools are typically supplied with a full mill test certificate (MTC) detailing chemical composition, mechanical properties, and heat treatment records. Some suppliers also provide third-party inspection reports and NDT (non-destructive testing) certificates to confirm weld integrity and dimensional compliance. Riddhi Siddhi Impex emphasizes these certifications to meet regulatory requirements for critical projects in cities like Mumbai, Delhi, and Visakhapatnam..

Frequently Asked Questions (FAQs)

Q1: What industries commonly use ASTM A335 P22 spools?

A1: P22 spools are widely used in power plants, chemical processing, oil & gas pipelines, heat exchangers, and high-temperature industrial applications.

Q2: Can Riddhi Siddhi Impex supply custom sizes and lengths?

A2: Yes, they provide customized spool sizes, diameters, wall thicknesses, and cut lengths to meet project requirements across Indian cities.

Q3: Are ASTM A335 P22 spools suitable for high-temperature service?

A3: Absolutely. P22 alloy steel is designed for high-temperature applications up to 600°C, offering excellent creep and corrosion resistance.

Q4: Do the spools come with quality certifications?

A4: Yes, all spools are supplied with Mill Test Certificates (MTC) and optional third-party inspection certificates as required.